If you lose a cap, just print a new one ;)
For THOMY tubes with a 3-way non-metric thread and also for metric standard tubes with a thread diameter of 15mm.
DISCLAIMER: It is expressly pointed out that this product is not an original product from “THOMY” or “SAURK”, but only a compatible product. The terms “THOMY” and “SAURK”, etc. are used for descriptive purposes only. The item is not a toy!
Do you know the SAURK?
https://www.printables.com/de/model/711247-the-saurk-thomy-tube-fork-easy-working-print

Der Autor hat dieses Modell als seine eigene Kreation gekennzeichnet.